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相关概念视频

Types of Semiconductors01:20

Types of Semiconductors

657
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Other Unique Bacteria

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Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
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Non-ohmic Devices00:51

Non-ohmic Devices

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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
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Schottky Barrier Diode01:27

Schottky Barrier Diode

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Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
401
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

281
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
281
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

386
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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全面耐辐射的半导体半导体

Alexander Azarov1, Javier García Fernández2, Junlei Zhao3

  • 1University of Oslo, Centre for Materials Science and Nanotechnology, PO Box 1048 Blindern, N-0316, Oslo, Norway. alexander.azarov@smn.uio.no.

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概括
此摘要是机器生成的。

具有/β双多态结构的氧化 (Ga2O3) 显示出异常的辐射耐受性,在不变形的情况下抵抗每原子数百个位移的混乱. 这使得它成为辐射硬化半导体应用的有希望的材料.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 半导体物理 半导体物理
  • 辐射伤害 辐射伤害

背景情况:

  • 晶体材料通常在高辐射流动下降解或变形.
  • 像 (Si) 这样的现有半导体具有有限的辐射耐受性,在最小的原子位移后变得无形.

研究的目的:

  • 为了研究氧化物 (Ga2O3) 结构的马/β (γ/β) 双多态的辐射耐受性.
  • 阐明在γ/β Ga2O3.3中观察到的高辐射耐受性背后的机制.
  • 要了解在辐射下β-to-γ Ga2O3的转化.

主要方法:

  • 在室温下使用玛/β (γ/β) 双重多态Ga2O3.3的辐射实验.
  • 对材料结晶性和无序积累的分析,每原子可达到数百个位移.
  • 研究Ga-和O-亚网格特性在辐射反应中的作用.
  • 作为疾病和植入物种的函数,研究β-to-γ Ga2O3转化.

主要成果:

  • γ/β Ga2O3 结构具有显著的辐射耐受性,能够承受高水平的干扰,而不会显著地丧失结晶性.
  • 在 γ-Ga2O3 中的氧子晶格显示出强烈的再结晶趋势,抵消了原子移位.
  • 从β-Ga2O3转变为γ-Ga2O3与增加的障碍有关,并受到植入的原子化学的影响.

结论:

  • γ/β 双重多态Ga2O3 与传统半导体 (如Si) 相比,具有更高的辐射耐受性.
  • γ-Ga2O3独特的亚晶格性质和再结晶行为有助于其抗辐射.
  • 具有 γ/β 双多态结构的 Ga2O3 代表了一种全方位耐辐射半导体的新类.